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Feature #62670
open[RFE] cephfs should track and expose subvolume usage and quota
Status:
Need More Info
Priority:
Normal
Assignee:
Category:
Performance/Resource Usage
Target version:
-
% Done:
0%
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Description
Subvolumes may be queried independently, but at scale we need a way for subvolume usage and quota thresholds to drive alerts within the ceph as a healthcheck, and/or via prometheus as alerts and usage metrics.
Here's some ideas for the kinds of metrics that would be useful for the mgr/prometheus module to expose for alerting and usage tracking
ceph_fs_subvolume_count{fs_id="1", data_pool="pool_a"} <n>
ceph_fs_subvolume_metadata{fs_id="1", data_pool="pool_a", name="subvol_1", } 1
ceph_fs_subvolume_usage_bytes_total{fs_id="1", name="subvol_1"} <n>
ceph_fs_subvolume_quota_bytes_total{fs_id="1", name="subvol_1"} <n>
With metrics like these, we could
- raise alerts on quota near full to avoid application outages
- use promql functions like predict_linear to forecast fill rates per subvolume
- understand overcommit of the filesystem (sum of quota > fs capacity)
- identify unused subvolumes so admins can follow up and delete
Having these metrics would be key to managing the capacity usage within native cephfs and ganesha/cephfs
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